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Since imported infections were identified as the most important source of the virus on Chinese soil and cold-chain food was singled out as another loophole, the country has relied heavily on strict control at ports of entry to cut the virus' channels of dissemination.
China Petroleum & Chemical Corp will invest 70 billion yuan ($10.7 billion) in the North China municipality of Tianjin to break ground for an ethylene production base and new downstream material industrial clusters during the 14th Five-Year Plan period (2021-25), said a senior company executive.